2 Nagios services

Nagios is configured to display information pertaining to all NEOSYS client's server statuses which include multiple services such as:

HTTPS: Most of NEOSYS clients are configured to have external web access via secure HTTP protocol (port 4430) from outside office. Nagios is configured to check port 4430 on a regular interval of 10 minutes and display any issues in accessing the same.

SSH: As part of the support contract, NEOSYS should have external secure access to the client server usually over port 19580. Nagios is configured to check this port on a regular interval of 10 minutes and display any issues in accessing the same.

Ping: Nagios is also configured to ping the client router as a measure to check if router responds incase the NEOSYS server is down.

NEOSYS: This service works in a reverse direction, and the NEOSYS installation on the client server sends information such as databases running, current backup status, internal and internet IP addressess etc to Nagios on a regular interval of 10 minutes.

Some key information about Nagios is as follows:

Nagios is also configured to display information related to internal servers.

Clients hosted on a NEOSYS cloud server might not have services such as SSH or PING as this is monitored as part of the internal server service.

Nagios sends out email alerts to support2@neosys.com (which is forwarded to support@neosys.com) from 8 am to 12 midnight on all Dubai working days (Sun-Thu). No alerts are sent out on Fri and Sat, unless they are for NEOSYS internal servers.

Nagios Configuration files:

Commands to check different services. ~/etc/nagios3/commands.cfg

Contacts where support2@neosys.com is configured. Emails from nagios will be sent to the email ID configured here. /etc/nagios3/conf.d.backups/contacts.cfg

4.2.2.5 There is a problem with the USB media inserted for backup

4.3 Fixing "Cannot make SSL connection" error

4.3.1 Error Message

Users get the message "This page cannot be displayed" when they try to access the HTTPS website.
TODO Add screenshot

4.3.2 Cause

When there are multiple HTTPS sites on one server, any subsequent SSL self certifications seems to destroy all other sites with self certification where the export/REMOVE/import step is not done for some reason. See Export, Remove and Import Step

4.4.1 Nagios reports a hung process

4.4.1.1 Possible Causes and Solutions

4.4.2 Explorer.exe not running

Nagios will display this error for only Win3 at the moment.

4.4.2.1 Possible Causes and Solutions

This error means that the server has (for whatever reasons) rebooted and stuck at the Windows login prompt for someone to enter the username & password. (More info on explorer.exe is available at http://en.wikipedia.org/wiki/Explorer.exe)

Solution to this problem would be to login via Tunnelier and open up Remote Desktop Connection.

5 Configuring Sonicwall firewall to allow NEOSYS to update Nagios

5.1 Configuring Sonicwall firewall to allow NEOSYS to update Nagios

6 Counting current active users

NEOSYS gives an estimate of the number of users currently active by counting how
many users have been seen to be active, even once, within the last hour.

This can give a sense of the processing requirements for an installation.

The numbers can be seen in nagios installations screen from support.htm

Example:

Users: 5/4/2 Max: 7/5/2

Users means:

5 unique browser session ids seen in the last hour

4 unique user codes seen in the last hour

2 Unique IP Nos seen in the last hour (60 mins)

Max means the maximums of the above seen in any one of the last 24 hours.

In practice, the middle figure, count of unique user codes, is very
close to the real number of people active within an hour. However,
since the same user code can be used by different people, even on
different computers (although not at the same time) it could
technically be an underestimate.

The number of currently active users is usually much lower than the number of
registered users. This is because some registered users use the system
infrequently and many dont use the system all the time.

The total number of different user codes seen to be active over the
whole day is not shown. For that, you can see Usage Statistics.